Aww they are gorgeous! Muffin looks like a Chocolate Himalayan.
A few years ago I have a trio of Siamese Mice, I decided not to breed them and I was given a male hairless (you will realise I like my hairless rodents) to live with Siam. Sadly 'Nuddy' died a few days later and Siam was left on his own. I was going to breed the girls to get a couple of males to live with Siam but I decided to wasnt worth it due to lack of mice 'pet homes' in my area.
A year or so before that I kept a few pet mice, Milkyway was my 'stud' and I have a breeding doe with him called Galaxy, they had a litter and I decided to keep two out of that litter and called them Smokey and Bandit, she had a stripy face. I was given a 'pair' and they had a litter which resulted in one pup, I assume the male killed the others and he was called 'mental mouse'. Due to the close breeding it affected him mentally and would attack himself, we took him to the vets but they could do nothing for him. Around 4mths old I found him dead, I would imagine the inbreeding caused a premature death.
Smokey had to be PTS due to a large tumour on her face, then Galaxy suffered from mammory tumours so she was PTS. Bandit had already passed over and Milkyway lived until he was 6yrs old at the college I was doing my animal care at.
Sorry for blabbering on.

Emma x