Three questions for the OP.
1. How much is your entire collection worth? Yes, we are applying a dollar-value to your photo gear. Be detached. Do a full list, follow up with online research, and put a price on each and every item. This may trigger off some good lateral thinking.
2. How much do you have it insured for? Zero? Ah-hah! This is its true value to you, then.
3. If you were to somehow lose the entire collection today, which items would you replace? And how much would these replacements cost you? Another eye-opener here, I reckon.
Basically, what you do with and how you do it to your collection, is entirely your call. However, I would...
Ask my daughter which kit/s she wants to keep and use in her future photography. I know she is young, but it would still be her decision. At age 18 or 21, she won't then come back to you and say "back then, you promised me..." as she will have made up her own mind about what's what.
Keep the cameras that have family connections, and sell the rest. Forget "sentimental" value. Anything and everything can be sentimental. When you offload it, the sentiment usually goes with it, or shortly afterwards.
Set aside one or two camera kits you want to keep and use. Again, apply critical thinking. Why do you want to keep this gear? Will you use it? What for? Can these cameras be replaced easily and cheaply with more modern ones to do a better job?
If all this is too difficult, pack up the lot in a secure storage box and hide it away in the garage. Check it once every three months. Otherwise forget about it.
Overthinking is as bad as no thinking at all. The ideal lies somewhere in the middle.
And BTW, all the above is what I'm currently doing with my gear, so we are both in most excellent company!
