Hi Dave,
I would see a different consultant. The majority of menisectomy's are done keyhole these days, whereby they only trim the meniscus. Even for an "open" menisectomy where the procedure in not carried out through keyhole surgery they do not actually break the leg, (as in fracture it) they, they will make the incision, and either trim or remove the meniscus that way. As the operation is an "open" procedure, recovery times are longer.
so you should be able to do light duties after 1 week, and fully mobile within 4 weeks.
On a lighter note, congrats on your great news, kids over a certain age will always do it their way as they know best !!......I am sure we did !!
It's tough bringing kids up, but as long you are there for them that's all that matters. The great thing about being a grand-dad is that you can give them back!!