Basically good advice from Eric and Augustine, there is nothing "special" there. On the other hand, the vast majority of azaleas can become medium grade to really good bonsai in 25 years or less. Some in as little as 5 years, or if you start with better material 5 years is not unusual. If you want a souvenir from your mother in law's house, dig it up. If it has purple flowers, from the leaves I would say a kurume type hybrid is a pretty good guess and kurume make pretty decent bonsai. They are not able to make as big and heavy a trunk as some of the satsuki, but they do make reasonable bonsai. Understand you will be putting time into material that will need several years to bring it up to the quality of a $25 garden center azalea, but if it has sentimental value, you should dig one or two up. Look for the ones with the thickest trunks, those are the ones to dig. Get some Kanuma Japanese clay pellets to plant it in, or use pumice or a blend of Kanuma and perlite, or Kanuma and Pumice, or just pumice. Add some composted fir bark or sifted chunky canadian peat moss to the mix too. Try to water with rain water or water with low total dissolved Calcium, but never with water that has been "softened" by a water softener that uses salt for the process. Rain water, RO water, or low total alkalinity tap water is best. Part of the reason this azalea may be so slender and twiggy is that in Florida the majority of the soils in most places are too alkaline for azaleas. It may change it appearance, rapidly improve once you get it in a slightly acidic soil and start watering with low dissolved solids water. Use Acid Plant Food like "Mira Acid" fertilizer. That will help too.
Kurume azalea are usually purple, but there are white, pink and red forms. Like the others said, even with flower and leaf photos, at best you will only be able to narrow it down into general type, you will never be certain exactly which cultivar it is. However, bonsai techniques for azaleas are pretty much the same across the board. Only difference from one type to the other is the timing as to when you do what. The whats are all the same.
Kurume types will flower first, then vegetatively grow, the Satsuki types will grow vegetatively for a month or so in spring, then flower, then have a second flush of vegetative growth. So once you can observe it more closely, you will be able to sort which group it belongs in by growth pattern. Then there is the ringer, Azalea species not related to Kurume and Satsuki will have their own pattern of growth, and knowledge of which species does what, when is beyond my skill set. But the pruning, wiring, styling and potting techniques are the same across the board, with the only variation being the timing of the prunings, etc.
Repot every second or third year in Spring, before blooming, pruning back hard at that time - you won't get flowers but that is the best time to repot. That is also why you don't repot every year, you want to see the flowers. Read the other azalea posts in this forum, there is a ton of information out there.