I am allergic to cats and it poses a problem when visiting my mother-in-law who have cats..what can i do?

See an allergist: An allergist can prescribe a comprehensive plan for pre-treatment with medications prior to visiting your mother-in-law that should help you tolerate the cat exposure for the length of your visit.

Sorry it is an issue: Not to get invloved with your family problems.It could be a valid excuse to go less.Just kidding..It depends what type of symptoms you develop and if you have other allergies...If they are mild you can try taking antihistamines a few days prior..Perhaps prescription nasal sprays as well...If you also have asthma it becomes more difficult and you should discuss it with your allergist. Good luck.