Here's my crack at having some fun with the situation.
I think I got Mum pretty well, but Dad was off a little bit- I think I made him too skinny. Then again, my wife thinks my Dad is the more accurate one. Regardless, they were happy with the job.
Not long after doing this pic for Mum and dad, I had the opportunity to do a "live" caricature. We'd gone away for the weekend and staying with us was my wifes auntie and a friend of her who made these cute copperwire bugs. I'd taken down some of the storyboarding I was doing to do in the evenings (yeah, work, work, work) and this friend asked if I'd draw a picture of one of her bugs. I figured that was rather boring and decided to do a caricature of her instead. Unbeknown to her and everyone else in the room except Nik, I discreetly studied and knocked out a caricature while she was busy working on one of these bugs. They all figured I was working. It proved very entertaining when I presented the finished picture (unfortunately I didn't get a copy of it). It had been a while since I had done one with the subject in front of me, but it was great fun, and with the model in front of you, you can explore different angles, and see different expressions to figure out the best result.