The BSA is a Blue Star, circa 1936.
These came in 350 and 500 versions, maybe someone can pick which this is.
e.g.
http://home.planet.nl/~leonhop3/1936_r20.jpgNo mufflers on your grans bike, which is interesting.
Indian looks to be a Scout sidecar model, electrically equipped.
Has a front brake, and tank between the frame rails, so its going to be the famous 101 model, circa 1928-30.
750cc v-twin, although a few of them were 600cc.
Said to be one of the best models of Indian ever made.
Highly collectible, and still quite rideable these days,
If you master the suicide clutch...
Great pix.
hth.