Is it permissible for a husband residing abroad to marry a second woman without his first wife's knowledge, and what is the ruling on leaving older children with their grandparents in one country while the younger children are with the mother and father in another country, and what is the ruling on a husband leaving his wife and children with his parents in one country while he travels to another country?

Obedience to parents is in what is good, and it should not cause harm to the child or their family. Scholars have set conditions for the obligation of obeying parents. Convincing them is preferable, and if they are not convinced and become angry, then one should strive to earn their satisfaction. Marrying a second wife does not wrong the first if one is just between the two wives, and this justice is obligatory even if the two countries are different.