#3- width 10.6, height 10.7, bone seems a bit spongy, but should be ok? It’s not quite as wide as you think your measurement is very far down in the bone and it’s much thinner towards the top. You should be able to get an implant in there, but it’s not quite as wide as you think.
#4- width 7.3, height 13.6, width can benefit from guided bone regeneration? Again very similar to tooth number three but your measurement is a little bit more accurate but when you try to measure the width, do it slightly below the rest of the bone so it’s more accurate of what you will actually see during surgery
#11- width 3.3, length 10.6, would benefit with GBR. Looks like a difficult case for a newbie? Severe resorption definitely not for the faint of heart. Absolutely needs a ridge augmentation and if you don’t do those or do them well I would definitely send it to someone that does typically a periodontist or oral surgeon but make sure that they do them often and well.
#13- width 7.8, height 11.6, should be ok? This is definitely your more straightforward case nice wide, bone and pretty parallel buccal and lingual walls.
#14- width 7.8, height 10.8, there seems to be a root tip embedded? I can go in extract, curettage, BG and wait? This one doesn’t look like the height measurement is correct there’s not as much height there I believe at least from what I can see from that single screenshot. This will most likely need a vertical sinus lift or what’s not as a Crystal sinus lift, and that doesn’t look like a root tip and that pic to me it looks like xenograft was placed sometime ago which is basically cow bone which shows up much more radioopaque. As the posterior teeth are infected as also, make sure he gets those out so it doesn’t complicate anything that’s done. Especially at being family I don’t know how often you do these procedures, but might be best to refer out for some of the more complicated areas and you can extract and graft whatever posterior infected teeth are whether patient likes it or not things will get worse if that doesn’t get taken care of. Best of luck.