As for dad, don't let him near his kids! Once the mamma rat has babies you have to get the dad rat out! In fact after breeding the rats you should put dad in a different cage as mom. The babies should be taken away from mom at 6-10 weeks. For male babies six weeks is important or they will breed with their mom. You need to take the male babies into a whole cage all to themselves. No dad, no mom, no sisters! Dad will fight and they'll breed with mom and siblings. so take males away at five to six weeks. You can keep the females with their mom their whole life unless you plan on breeding mom after these grow up.
as long as they need to.
rats...
20 months
20 months
About 2 years
8 years
10 years
3 maf
2 weeks
25 years
They stay for 10 months then go their separate ways.
as long as they want to