How can one pray to Allah for forgiveness, and do the parents bear sin for what happened, and how can one pray for their forgiveness, and how can telling a daughter a different birth date than her actual one be remedied?

If a guardian prevents his daughter from marrying, and she needs to marry, and she fears temptation for herself, especially with suitors available, then this is unlawful and an act of 'adhl (preventing marriage) for which the guardian is sinful. The girl who was prevented from marrying and committed a sin must repent to Allah. If a pregnancy occurs after the marriage contract, then it is a legitimate child attributed to his father, and its status is known six months after the spouses come together. The strained relationship should be handled gently, and the mother should help her daughter overcome the ordeal and correct her mistakes.