The first week was a little crazy. I think a sibling with similar anatomy may have been a better choice for Morgan. Both of them have been very focused on 'the penis' and Morgan was adamant that she had one and could stand up to pee just like Griffin. She insisted on standing up a few times and letting pee drip down her legs and onto the floor. We finally convinced her that she could sit backwards and that that was almost the same as standing up. Luckily she is now content to do it the old way.
Griffin is still working on getting fully potty trained but it has been so much easier than Morgan. How did I ever complain about potty training with my other kids? It has helped Morgan to have Griffin doing it at the same time. She has made great progress and now tells us when she needs to go (about 80% of the time) "I go potty" and can go 2-3 hours in between bathroom visits.
The penis envy has slightly subsided now but we do still get the occasional "cool penis, Griff" to which he politely says, "thanks" (he knows it's extremely cool and that Morgan can't have one!) as he finishes his business.We've also finally been successful with teaching Griffin he does not have to stick his head through the lifted toilet seat and put his hands all over the toilet bowl.