How do nuclear membranes form during Telophase of Mitosis/Meiosis?
According to this book, during disassembly of the nuclear envelope, the nuclear membranes are broken down into vesicles. The nuclear membranes reform at the end of mitosis as the vesicles bind to the surface of chromosomes and fuse with each other to form a double membrane around the chromosomes (how this happens is not clear, except that integral membrane proteins and lamins may be involved, but physical contact is supposedly the first step).