If a kaafir becomes Muslim, what is the ruling on his illegitimate children?

Prohibition on buying goods from their sellers before they reach the market

He has become Muslim but his mother wants him to go back to being a Christian

She became Muslim but her family do not know and they want her to marry a non-Muslim

He wants to become Muslim and marry a Muslim woman

Should he let his Christian aunt stay with him so that he can call her to Islam?

She and her married boyfriend want to become Muslim – can they get married after they become Muslim?

He is Debating with a Christian and is Asking: Does God Have a Spirit?