these dont sound good mate.
keep them seperate so any infection does not spread between them.
get some flea powder and cover them,and any bedding in it,
if the jill is loosing weight could be a kind of flu, i would 1st check her mouth make sure she can close it properly and has nothing
wedged in her teeth or throat,this can happen if fed rabbits ect.
try her on an easily digestable food eg bread& milk then put her on proper meat, birds or rabbits.
i would do the same with the hob if he is down in condition 2
remove what ticks you can,
you could use tick and lice spray used on