The guide is very succinct, but heres a few cliffnotes:
age 0-6 stat growth is based on base stats of father and mother
age 7-16 stat growth is based on stats of guardian. every year on your child's birthday they have a chance to 'level up' their stat by 1 point, this is a % based occurance dependent on the stat values of the guardian. 15+ almost ensures a proc.
Child's education trait will always be the same as the guardian, but not necessarily the same level (quality)
finally, your guardian gets all the events that you do when you mentor a child, and they will pick the options that mimick their traits. So a slothful guardian has a good chance of making your child slothful. So avoid guardians with lots of deadly sins or traits you wouldn't want for yourself.
age 0-6 stat growth is based on base stats of father and mother
age 7-16 stat growth is based on stats of guardian. every year on your child's birthday they have a chance to 'level up' their stat by 1 point, this is a % based occurance dependent on the stat values of the guardian. 15+ almost ensures a proc.
Child's education trait will always be the same as the guardian, but not necessarily the same level (quality)
finally, your guardian gets all the events that you do when you mentor a child, and they will pick the options that mimick their traits. So a slothful guardian has a good chance of making your child slothful. So avoid guardians with lots of deadly sins or traits you wouldn't want for yourself.