I generally feel safe riding my bike in Philly, though I try to stick to the bike lanes as much as possible. Not sure I’d do it with kids unless you’re sticking to one of the river trails. Our bike share system, Indego, is so-so. I’ve had several trips where the rack wouldn’t acknowledge I’d locked my bike so I had to waste time chatting with support. The bikes are pretty heavy (thought not as bad as Baltimore’s), and unlike in some systems (like NYC) you have to pay extra for a pedal-assisted bike.