My family (my husband, my son, my daughter and I) is living together with my parents, who are seventy years old. My parents are helping me with the caring of my daughter, who is only 10-months old. I ...
You mixed several issues together. 1. Unless you can't efford it better don't live with your parents. It is not healthy. 2. Both families need there space (your parents and your family). 3. Being 70 years old your father is sure not cheating any more. If he cheated it was many years ago. No need to raise it now. 4. You could run to the wrong conclusions. Give your father the benefit of doubt (assume that he can provide a good explanation to what you heard). 5. I bet that you faught with your father because you had some inner anger to him (knowing that he cheated) 6. Appologize (tell him you were in a bad mood that day).7. Keep your temper, control your anger, remember that your parents did much for you (don't take it for granted !).8. Say nothing to your mom. It will break her heart (if she knew nothing) and it will not help (if she did know).
Thank you very much for your advice.