Can i as co executor go alone to the home

You can probably go to your Mom's house without her. Here in Wisconsin co-executors are considered as one for actions regarding the Estate....

Yes, there is no time of day or night for signing that makes a will invalid

Does someone contesting a will in NV have to show up in court?

If it gets to a hearing then you will want to present evidence and probably testify yourself in court.

It is true that the will must be signed by at least two witnesses in order to be valid. This illustrates the problem with doing wills off of the...