I would also suggest OP to keep what you have and adding lenses
Somewhat like you, I only photographing my daughter and some family events, that’s the only reason I got DSLR and do not want to (and can not) get rid of it. I also want to have the DSLR with me as much as possible, so the weight of full frame (and lens) stops me, for mirroless , the AF and lens availability (and appreciation for used ) stops me go light. Ever since I have swapped, collected my main setup below, I simply loose the interest to swap/upgrade
T4i + 18-135 STM , great for walkaround, only lens need for outdoor and vacations. I had 24-105 before, 18-135 STM is on par with it (or so close to it) and have extra reach as well as light weight.
Sigma 30 mm f1.4 - in door lens. Simply amazing result. With it and a bounce flash, I doubt there is much PQ difference from a 2x price full frame+lens setup
Sigma 70-200 f2.8 OS - use it only once a while, most of the time it is in the box, but it is needed for dance recital, school concert, indoor sports. That’s kids moment you want to capture for memory, and 200mm on 1.6x crop is needed. 200mm on a full frame doesn't provide enough of reach for most of the time ( well you can crop it, some people would debate )