Is Hoarding Something That Is Genetic?

Yesterday I passed by this guy's house who is around my age, who I have always sort of knew of. When he was a kid, he lived in a house that had shite piled up everywhere outside. Evidently it was even worse inside. I think it was just him and his dad who lived there, but it is safe to say his dad was a hoarder.

It's been awhile since I passed by his house, it was probably soon after he moved there (as in within a year or two of him and his wife moving in). I remember them having everything really nice. The landscaping was well done, it sort of stood out in terms of how nice they had it. Fast forward to 6, 7, 8 years later (yesterday) and it looked as if they haven't done much work with the landscaping since they first fixed it up.. They have an open parking garage and that's when I could see it. They had shite everywhere. 4 or 5 bikes (they have 2 or 3 kids). Boxes stacked up, it looked as if they took their Christmas decorations and put them in their garage. It was as if you could see it starting to build up.

Just shite that they probably should have just gotten rid of (like a few of the bikes.. especially since one or two were rusty). The house he grew up in had boxes of shite that filled their garage to the point no one could park a vehicle in it and that's what it's starting to look like. It's like there are boxes of shite they could throw away, but they put it out there... As if one day they will use it.. Seriously, do yall think that shite is genetic? How does someone go from making their home look really nice outside, etc to just piling shite up?