Im a new dad aswell 7 months in now so somewhat a veteran
My other half exorcises me as much as possible as it just works better that way in the house – riding time has gone up but traveling time has gone down as i don’t drive to ride anymore found some good local rides which are great for my fitness and in turn have improved my Gnarr days out as well .
Get what you can afford and the 2nd hand market for 26″ bikes is so poor you can pick up some amazing bargains Including “Shameless Plug” my Medium Turner 5 spot on here ! – Dont think its what you are looking for mind
good luck and happy trails !