English seldom sounds 'too' polite. I think '
Would you like to?' works fine in almost any situation-- I certainly use it to my wife and son when I am being nice.
'
Do you want to?' is the familiar equivalent, used
only with wives and sons and other relatives, close peers, and close friends and acquaintances.
They are both suggestion forms, though of course '
Do you want to?' can also be a strict enquiry in the appropriate context.