Is this weird/wrong?

My cousin (who has a 2 yr old daughter from a previous relationship) has been dating a guy for about 9months. Over the Holiday weekend we had a BBQ and the 3 of them had came over. My cousin starts telling a story and she said "David and Ashley were in the shower together" and continues the story. I was instantly put off guard that this guy had been showering with her 2 yr old daughter. Am I wrong for be a little concerned by This? My daughter showered with my husband until about 2,but that's her Father so its completely different. What's even more concerning is her new boyfriend was once accused of sexual molestation about 5 years ago,so why even take the chance? Should I speak to her or drop It? I get it,not my life or business but I can't turn a blind eye when something aots with me uneasy,especially if it has to do with kids!