I really think some people are just attuned to this kind of thing.
DH often sees things, the property we live in now was a probate sale, the owner who lived here before, died in the property (I only know this, as solicitor sent me a copy of the bundle which also contained the owners death certificate) for the first 10 days living of here, we found it a little hard to settle, one morning DH, said I saw the owners spirit last night, like a ball of energy that looked in our room and then went along the hall and out of the door.
We both used to see shadows of children in our previous home, (built on grounds of a school) particularly if the door to our en-suite was left open, so I always made sure I closed it at night. As this used to stop it.
When DS2 was about 3, we were in a shop and the assistant was talking to him and said what’s your name he said x (late FIL name) but they all call me x. FIL had died 20+ years before, and was only ever referred to a Grandad, never by his first name.
The night MIL died, we were away on holiday, DH woke at about 3am, all the hairs on his arms felt electricifed, he looked over to the bathroom and he could see the perfect silhouette of his mums shape, the next morning he said I know mum has gone, I can’t understand why I haven’t had a phone call, where we were staying had poor mobile phone signal, the call came to say MIL had passed away, in the early hours of the same morning DH had had the strange experience.
So many things over the years, too many to just be coincidental. People can believe or not it doesn’t matter to me, but all these things have happened over the years.