My son and best friend are dating

I guess if you have kids young, you don’t really take into account that this could happen. I knew a woman who had a child at 16 but her own husband was 14 years younger than her which she met later in life. So her son’s step dad was literally 2 years older than him 😂. They had another child together when she was in her 40s.

Your story a little different but it still applies.