Just because one or more of your family members may be disabled, this doesn't need to cut your holidays short, or warrant them being left behind and missing out on all the fun to be had, as there are many holiday destinations that are aligning themselves with the progressive anti-discriminatory stances taken by the various socialists groups, who cater for disabled people to make their holiday experiences just as comfortable and memorable as those of any other person.
Naturally you will have to do some pre-trip research, on the planned holiday destination, with the possibility of even getting a discount, as an extension of goodwill from the travel destination management.
There is no better way than to ask directly about your planned destination's disability friendliness, as those destinations which are really disability friendly, will be very proud to include that in their information sources and reviews, but it is always good to ask as you might come across a lot more information than you might have gathered on your own.
The best sources of information are independent listings, something like the HTC (Handicapped Travel Club), which are contributed to by holiday destinations that meet their requirements, with facilities in place like wheelchair ramps and paraplegic bathroom facilities, etc.
A lot of modern day holiday destinations have their infrastructures constructed with people living with disabilities in mind, with a lot of flat surfaces that are easy to move around on, with a wheelchair, but others go out of their ways to cater for holiday makers with disabilities, offering discounted rates for each disabled guest and deploying disability aid staff to help with any difficult tasks, like climbing into vehicles and the like.
Traveling to a place like Thailand's Koh Chang Island is a great option to have, as many of the destinations are disability friendly.