Good points Jon.
Kaltheus being a Tytalus I'd say would have been proactive rather than reactive with his children.
How about this for a different scenario? - First kid gift, 2nd gift gifted - his reaction so far - "great!" 3rd kid gifted, 4th kid gifted - "oh snap I better do something before they all get poached/Bonisnatched!"
If you're ok with it, I'll do the first 5 are gifted children - the second 5 are not gifted.
I think he would have looked for suitable magi to take on the kids #3, #4, & #5, gifted of his children as Apprentices, then trained the first two. I think it would be reasonably astute for him to travel and find appropriate Bonisagus magi looking for an apprentice in the first place - makes Bonisnatching very unpalatable when one has been generous with his own children.
The reason for keeping the first two - they have the Gentle Gift, the latter 3 do not.
20 years out:
Year 11: Latin +25xp, Order of Hermes Lore +15xp - begins some travelling to other Tribunals, visiting magi in other covenants and gathering information.
Year 12: Order of Hermes Lore +20 XP Charm +15xp, Ignem+5xp
Year 13: Order of Hermes Lore +25xp, Folk Ken +15xp
Year 14: Order of Hermes Lore +30xp, Leadership 10xp.
The Order of Hermes Lore 6 represents his search far and wide for appropriate Mater/Pater for his children to give them a good Christian upbringing and also be a good parent for his other 3 gifted children. Kaltheus would most definitely make a point of 1 or 2 going to House Bonisagus and letting other Magi know about it after the transfer has been completed.
Now at this point, he has 70 BP:
7 BP will be spent on vis for a LR: for 33 pawns I think he can get a -17 bonus to aging rolls? (7+101+ 52 + 2*3)
The covenants chapter has BP cost of com+teach+highest ability desired, but Kaltheus would have this man on retainer for a few years and then relieve him from service. An aged Church Acolyte or Monk would be appropriate I think.
The cost would be (teach+com = 10) + highest other ability (5) = 15 BP for purchasing a specialist for the covenant. This tutor would be expected to at first give 1-2 tutoring for the older gifted children, and once they are finished, the remaining children. A church trained scribe with good knowledge can support themselves fairly well.
The tutor will have teach+com 10 + base of 6 = 16xp / season for the older two gifted children, and +13 for the ungifted children. Latin 5, AL 5, Profession Scribe 5, Church Lore 5, Dominion Lore 5, Theology 5.
In either case: In the first year, the children are taught two seasons worth over the course of a year: Latin 2, Artes Liberales 2
Year 15: Apprentices his first two Children, (Gift Opened) now aged 8 &7, tutor teaches them Latin 3, Church Lore 1, Dominion Lore 1, Theology 1.
Kaltheus: Magic Theory+20xp,
Year 16: Two Seasons Teaching Apprentices - (Magic Theory +21xp each), tutor teaches them Profession Scribe 2, Latin 3, 15xp.
Kaltheus: Creo +20xp. 3rd child sent away at age 7
Year 17: Two Seasons Teaching Apprentices - (Magic Theory +21xp each), tutor teaches them Latin 5.
Kaltheus: Creo +20 xp, 4th child sent away at age 7
Year 18: Two Seasons Teaching Apprentices - (Magic Theory +9 xp each, +12 something else) Tutor teaches them Profession Scribe 3.
Kaltheus: Ignem +20xp. 5th child sent away at age 7
Note: Will assume that both apprentices have an Int +1, Magic Theory 4 for a total bonus of 2*5=10.
Year 19: Two seasons teaching apprentices. Creo +15xp Ignem +5xp, : Tutor now begins teaching the non gifted children.
Year 20: Two seasons teaching apprentices. Creo +8xp, Ignem +10xp, Corpus 1xp, Mentem 1xp
In Total:
Abilities:
Area Lore: Thebes Tribunal (Geography) 1
Artes Liberales (Astronomy) 2
Athletics (Running) 1
Awareness (Alert) 1
Brawl (Dagger) 1
Charm (Peasants) 3**
Church Lore (History) 1
Civil and Canon Law (Roman) 1
Code of Hermes (Wizard's Marches) 2
Concentration (Spells) 2
Dominion Lore (Saints) 2
Folk Ken (Magi) 3**
Finess (Fast Casting) 2
Greek (Roman) 5**
Guile (Fast Talk) 2**
Infernal Lore (Curses) 1
Intrigue (Gossip) 2
Latin (Hermetic) 5
Leadership (Agents) 2
Magic Lore (Legends) 1
Magic Theory (Learning Spells) 4
Order of Hermes Lore (Personalities) 6
Parma Magica (Corpus) 1
Penetration (Mentem) 1
Philosophiae (Ritual Magic) 1
Stealth (Urban Areas) 2**
Survival (Forests) 1
Teach (Apprentices) 3
Theology (Heresy) 2
Titanoi Cult Lore (Self Initiation) 3*
Arts
Creo: 12
Intellego: 5
Muto: 5
Perdo: 5
Rego: 7,2
Animal: 5
Aquam: 5
Auram: 5
Corpus: 8
Herbam: 5
Ignem: 10
Imaginem: 5
Mentem: 8
Terram: 5
Vim: 5
Oh: And Aging rolls up to age 50:
invisiblecastle.com/roller/search/1401507/
Somewhere in the late 40s gets an apparent aging to age 36. (20+4 - 17 -1) = 6 (Assuming general overall living conditions are +1.)