I'll try to make this as short as possible. In our Austin house, we've heard children's voices, that intense feeling of air being displaced as someone walks right behind you, loud footsteps, and other manifestations in our house for years. Including seeing dirty, child-sized handprints on the ceiling on our tiny square attic crawlspace door that has no pull-down ladder or anything. Other stuff I won't even say because it sounds absurd if you hadn't witnessed it. To the extent we'd joke about it with each other, because we never really felt threatened... but it was undeniable. Even asked neighbors about the history of the house.
At some point, my spouse randomly told me, without connecting things apparently, "have I ever told you the background of this painting?" We have this awesome abstract painting spouse bought a couple of years before we moved in together. It seems to be a pregnant figure rising up out of dark water, almost kind of angelic or supernatural. Spouse bought this direct from the artist who lived in Austin at the time, and would google her every once in a while to see what work she'd done/what she was up to. The artist moved away and then... the last time spouse googled her, came up with this:
https://www.vtcng.com/stowereporter/archives/wolcott-family-deaths-ruled-murders-suicide/article_9a0fa235-b9c0-5ed3-9bd7-e9e634380baf.html
I'm just like... we have little kid ghosts in the house, you never thought to tell me that?? Can a painting be a portal, I don't know... but it's sad and creepy. We love our ghosts though, they are family.