Bless your heart!! I'm sorry to hear that you have so much to take on with BOTH parents at the same time. Being a caregiver can be so stressful and exhausting mentally as well as physically. My prayers are with you and your parents.

Now for this kitten! Only you know if you will have time to make introductions and meet the needs of a kitten. It could go very smoothly or it could be one of those "Tons of Patience Required" situations. IMO...foster the kitty and see how it goes. If transitions are easy then you wouldn't have to have an added pressure worrying about that. You may get the kitten home and find that this is just not the right time in your life to deal with it. You would still be doing something great by fostering until adoption.
This baby may be exactly what you need in your life right now. Lord knows that kittens bring smiles, all out laughter, and lots of love.
Don't worry about hubby...they somehow seem to adjust.
Good luck and no matter what you decide it will be the right thing in the end.