Answer
If any body parts came out, then it will intercede for the mother on the day of Qiyaamat. (Shaami vol.2 pg.228)
The child who is breastfed by his maternal grandmother cannot marry his/her maternal first cousins. However, his biological brothers and sisters may be able to marry them. (Hidaaya; Hindiyyah)
and Allah Ta’ala Knows Best
Mufti Ebrahim Desai