I do recommend you take some time to look through our Tips & Tricks forum: http://www.tamatalk....ips-and-tricks/
There are pinned threads that offer an Index (List) of useful tips and tricks on each version.
(V5 Tips & Tricks Index: http://www.tamatalk....s-tricks-index/ )
This is a reply I found posted in one of the V5 Useful Topics Index:
From what I remember from the V5 (not celebrity), the Mame family can turn into a large family if overfed (any V5 family will turn into large if overfed).
If you overfeed and characters become large adults, the parents also become large and can't change back - this applies to 2nd generation onwards.
(I think that info is also posted somewhere in the Tips & Tricks section )
I am not sure if this answers your question. I am a bit confused with your wording (and I don't know the V5 so well... I have not run the V5 for years now!)
Edit: Maybe you were asking about teens turning into large characters? No. Only adults and parents turn into large characters. Not teens.
Edited by TamaMum, 01 June 2014 - 05:20 AM.
added note about teens