Well science aside, it always ruins fantasy ya know, besides, a bunch of 2 headed freaks may be fun.
My choices would be:
1 My wife- she keeps me stable
2 My bro- he tilts me off center
3 A farmer- Provider of crops and raises livestock
4 A doctor- healer
5 A botanist/pharmacist- medicines from plants
6 A survivalist / hunter- protector, provider
7 A carpenter- Cutting timber transforming to structures
8 A physics guy- basic brainiac
9 An artist- various arts music, storytelling,paint
10 A vet (we'd bring horses and cattle)
11 A metalurgist- Finds and works metals
A plumber- But I am one so thats not an extra body
12 A prositute- Morale officer
13 A chef- He would also have to know how to slaughter
14 A teacher- to educate...would help the carpenter in the summer
15 A religious leader- to hold the unit together
16 A cloning expert- brings with him vast amounts of gene material

17 A good judge- hard to find but we'd surely need one sometime
18 A shipwright- We may need boats
19 A meteorologist- (sp) need to know whats coming
20 A brewer- Can make spirits etc for us to party with.