This is my family. Sadly, the language dies with my generation. My father speaks this dialect of Spanish... or at least, he used to. We moved to Northern California when I was very little. But, if we had stayed in New Mexico, my cousins don't speak it either. I asked Dad why he didn't teach me. "What would I do? Speak it to myself?" I took Spanish in high school. My father really couldn't help me, some of the basic p…
I think that if you want to, you could learn "standard" Spanish and still have an understandable conversation with you family. At least for me (I'm Mexican) the people in those videos were easier to understand compared to the average Cuban Spanish, for example, which is one of hardest variants for me.
And the differences in vocabulary is something you'd have to face regardless of the language variant. For example, I usually call a belt "cinturón" except for martial arts belts which I always call "cinta", but right now I just searched for "cinta negra" images and all the results were black adhesive tapes and black ribbons.
But yeah, doing so would take many years of "talking like a preschooler", there's no escape from that.