Please Help, i think my dad is cheating on my mum?

I know this kind of things can be really tough....I know this is not the best to do but this is what i've did/benn doing is to ignore it and move on with ur life....this is the kind think that u dont wanna point out and tell ur mom cuz it could ruin everything i guess it's the best that ur mom doesnt find out...Good luck i wish u the best