Betty,
Thank you for telling us about your good times as well as bad. As Ed says, we need to build memories.
I have to fight against crying, because crying seems to constrict my throat and really hurt - laughing does not hurt, though!
I am glad your sister is feeling well enough to want to do fun things. She will probably be very tired pretty soon, so plan to do what you can while she feels up to it.
Leena