That 44 carbine is plenty of gun. I used a 12 gauge with 3" mag 00 buck for a close in gun, they never ran far on me. Most of mine was night shooting back in the 80s before all these new gadgets. I never had dogs, etc...mine was straight pest killing. I did rifle a few big boars, 400+ lbs, and I never got real close to these guys, but I'm not sure being on the ground limited to a single 44 slug, is what Id do.
Murphy's 8th rule of combat
Everybody has a plan, til the shooting starts!
Id definetly have a backup man with a big o/u or sxs 12 gauge with hefty charge of 00/000 buck. If I was on the ground with my child, without fail 1 or 2 of us. Those few HOSS boars I took were russian/feral hog crosses, and had some monster cutting tools on them. Had one take 2 rounds of 35 rem, first at 60 and the second at 15, and still run 30 yds. First was mid ribs and the second was a shoulder breaker. 35 Rem is a big bullet.