Question: 

When a baby girl is adopted and breastfed by the adoptive mother, do the brothers of the adoptive father (married to the mother) become the baby girl's foster uncles and are they regarded as Mahram. 

The foster mother fed the daughter with hormonal tablets which created the milk within her.

In this case does the foster father become the foster daughter's Mahram, and do the foster father's brothers become her Mahrams or not?

Answer: 

If a man touches his daughter with desire, will his wife become Haraam upon him permanently?

Yes, if he had touched his daughter that has reached the age of puberty or is close to the age of puberty in such a manner that he was able to feel the heat of her body, and due to such an act
of touching, lust and desire was created within him or his existing desire had increased further, then his wife will become Haraam upon him. He should now end his marital relationship with his
wife by divorcing her. (Fatâwâ Mahmûdiyyâ p. 512 v.16)