How you mean it? Was pretty bad situation tbh. My french Granddad already had a family in France and ran off as soon as he heard that my Grandmother is pregnant.
Imagine my Grandmother alone-parent (was way worse seen as nowadays) and to make it even worse, a baby from the "archenemy" of Germany at that time.
She then went to marry an ex-nazi who was much older than her (well she had no choice and needed financial help). This fucker treated my dad pretty bad, beat him up on a regular basis etc whenever he was frustrated about something. He had to move out with 14 to escape the situation (to a "care family"). His real dad never contacted again. My dad tried to find him mid 90s but he was already dead by the time.