The Best Intentions

I have three daughters, 10, 12 & 15. We have had the same nanny for two years. In this time, she has gained, I would guess, at least 50lbs. I have noticed my 12 year old is also getting a very round belly and weight on her legs. I'd like to address the two things at once and do something positive for them both, perhaps ordering pre cooked nutritious meals for them both and getting them a tandem bicycle? I am fairly sure I could do this without offending either, but how would I present it in such a way that I don't pressure either of them? My husband says it's a bad idea because if one or both don't lose weight they will feel badly about themselves and guilty.
*side note- My 12 year old child is extremely close to her nanny.

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