Is a man considered a guardian for his two daughters from a woman he lived with and had children with before marrying her, knowing that the mother did not observe an 'iddah of clearance? And is the husband of his daughter from his first marriage considered a mahram to his new wife?

The two daughters born out of wedlock (zina) are not attributed to their father nor are they his lineage. They are strangers to him and to his children. Their guardianship belongs to the legitimate ruler (Sultan), and if none exists, then to the general Muslim community. This man can be their guardian. A man's marriage to his daughter born out of wedlock is valid, and he can be married to both the woman and her daughter from a previous marriage simultaneously. This marriage proceeds based on the opinions of some scholars, with the intention of continuing the marital relationship and to avoid corruption in an environment that encourages it. They must both offer sincere repentance and raise their offspring with sound upbringing, and depart from lands of corruption unless there is an urgent religious necessity for them to remain.