Will my children face consequences for what I committed before sincere repentance?

That a person might be punished through his family in the same way he slandered others is possible, but not necessarily so, especially if he has repented to Allah with sincere repentance. It is hoped that his family will be safe from such harm, by Allah's permission, especially if he strives to raise them upon truth and guidance.

The fiancée is a stranger to her suitor until the legal marriage contract is concluded. Therefore, private seclusion with her is not permissible. One should hasten to complete the marriage and not delay it, for life spans are limited.