+1 for NYBonsai12's list
Almost nobody is lucky enough to have their own kids get interested in bonsai. Not unless you were already showing a net profit over $100,000 per year from your bonsai nursery, which I am pretty confident not more than one or two nurseries in the USA would net over $100,000 usd.
Sometimes you get lucky and a kid from your extended network of family and close friends will get interested, but most often, the only people interested in your bonsai will be friends you have made through the bonsai hobby, friends you probably would have never met except for this hobby.
I'm 65 years old, and have every intention of "doing bonsai" until the day I drop dead, hopefully 20 or more years from now. I buy, sell trade, & gift away trees all the time. New trees come in, other trees go out. My collection of 100+ sticks in pots in various stages of development is entirely different than it was 10 years ago. Only 4 or 5 trees have been with me more than 10 years, and I started raising bonsai over 40 years ago. Though granted, I've only been serious about it since about 2004.
Point is, get over the idea that you will be the "only owner" of a tree. If a tree develops to the point where it gets interest at shows, sure enough, you will find people interested in taking on a tree after you decide you have had it long enough. Even "pre-bonsai" sticks in pots others will get interested in, so passing along trees is a normal part of the hobby. As you make friends in the hobby, you will see someone with something your are interested in, and next thing you know, you end up trading. Bonsai is not permanent. We are all temporary care takers of our trees.
Bonsai as Gifts, this is an activity that is fraught with hazards. Will your friends avoid you if they kill your gift tree and feel guilty about it? Will your friends feel imposed upon if their mild interest in bonsai is not up to the demands of actual bonsai horticulture? Key is, if you give gifts of bonsai, expect nearly 100% mortality, and be pleasantly surprised if the trees actually become the hook that brings your friends into the hobby. It rarely works out the way you picture it in your mind.
Better might be a good book, like one from Colin Lewis, or a picture book of bonsai. Check out the selection at Stone Lantern. A book won't die, won't make someone feel guilty, and might be just the hook to get someone to try on their own.
Or ask first before you give a tree. Don't surprise them with one.
Also, giving a winter hardy tree, will make the recipient crazy, because a dormant mugo should not be brought indoors for more than 10 to 12 hours at a time, or it looses winter hardiness and will need protection to finish the winter. Same with a juniper. For winter gifts, give a sub-tropical like gardenia, florists (not cold hardy) azalea, Ficus, or other sub-tropical.
With the mugo, I'd pick them up now, a good bunch of them. Winter them in your own back yard. Give them away in spring or early summer after you have repotted them to bonsai pots. Give them as random acts of kindness gifts, and giving them while in active growth allows the recipients to enjoy them for the summer, before having to put them away for winter dormancy. Keep a few extra mugos for yourself to sharpen your own mugo skills with. They are slow, take time and are very much well worth the effort and patience required.
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