Several questions about forming an LLC

[John Public]

I have a friend that asked me some questions about forming and putting property into an LLC and I couldn't answer them. So I thought I would ask them here.

Is it possible to setup the LLC so that two people have 50% control and that neither can legally do certain things without the other's explicit written approval.

Also, for estate planning purposes. Is it possible to put one's own property into an LLC and make it the ownership of the LLC and put in some legalese to say that the LLC transfers management to the children when the parent dies? Would this strategy avoid estate tax (legally of course)?

Thanks