find out if my house is haunted

even though no one smokes in my home. It’s an older home, not sure how old, which was extensively remodelled by the former family. However, the person who purchased it (our landlord) did do some more remodelling after the purchase. I know the father of the family passed while a resident here, not sure if it was IN the home. The mother passed away only a few months ago, less than a year after the husband passed away. I know the son of the couple and he has toured the home and said there it was very different from how his mother left it when she moved out. The master bedroom stays much cooler than the rest of the home. I often smell cigeratte smoke aroud the house, but my husband and I don’t smoke. I don’t know if the former couple smoked, but I know the son does. The only other thing I could think would be my father who passed away nearly 10 yrs ago, who was a chain smoker. My mother has seen and heard him around her home for some time after he passed. They recently moved a second time after his death. Any ideas?? I have a toddler, he has acted strange on a few occasions, but not really scared. my mother has said for years her family were “sensitive” to paranormal activity, which I have experienced personally. I don’t want to upset any family members that might be here, but I would like to know.