It looks like a yucca. Here is a link that might be useful: yucca

I see you're new here, welcome. Pls. do some reading around here on mixes. While it's good that you're already using Cactus & Succulent mix (C&S for short), you will quickly see that many if not most of us here have learned to amend our C&S mixes (w/perlite or pumice, at least 30% or 50% to be safest), 'cause these days, commercial mixes have too much peat in them (kills out plants) &/or include wetting agents to retain water (also kills our plants). Others of us on here use mixes you'll see mentioned as Gritty Mix or variations of 5:1:1, things like that, which over time folks have learned worked well for them. Also some of these pre-made mixes contain fertilizer as well, which many of us wish to control ourselves rather than someone unfamiliar w/ our growing conditions. There are lots of opinions on mixes, but key & accepted by all of us is that to grow C&S, we need fast draining mix & what you've pictured above doesn't look like that. So that's an improvement that could be made easily & help the plants more that almost anything else one could try.

It is an epiphyllum. There are many different varieties and they are widely discussed in the Cacti & Succulents Forum. Note that they are often called an "epi" for short. Carol Here is a link that might be useful:

what i would call.. a wild grape ...??? [which i wonder about after googling barrons answer???? t] usually the fruit is rather small.. almost all seed ... and not worth much ... a bird probably planted it ... but maybe not .. does the neighbor on the other side of the fence have any knowledge ... maybe the prior owner did his own wine?? there is a fruit forum ... and that is where you might find some grape maven who can ID plants ... beyond our abilities .... ken