Parents can give their child to others, but the lineage of the child will be through the biological parents only. Those who bring up the boy or girl do not become the parents, they are guardians and the child is not their progeny (aulad). <br /> <br /> These children are called foster-children. Allah SWT says in <span style="color: #993300">(Surah Ahzaab)</span><br /> <br /> <span style="color: #ff0000"><b>Translation: </b></span>And Allah SWT has not made your foster-son as your (own) son.<br /> <br /> This shows that a lady can give her boy or girl to her sister, but the children will be considered their children only.<br />