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May I add a little to the answers to your query.
Fostering children was quite a common occupation in the area. Quite how it was done I'm not sure though there are people still living around Tomintoul who were fostered and who married and stayed on. During the war a number of children were also evacuated there.
The cottage which was the Post Office was indeed close by the bridge. The cafe is/was half-way up the hill and above it is the old schoolhouse. It is not an easy stretch of road to negotiate in winter because of the gradient and the bends and it is best to stay in low gear and take it easy. There were originally quite a number of other cottages around the Bridge of Brown (Brig o"Broun). John Brown is supposed to have dismounted to help Queen Victoria to cross. (cf her Highland diary)
The designation "Bridge of Avon" can cause problems. If you are using the Kirkmichael census then this refers to the old Wade bridge (now with a new bridge built beside it that was opened by Prince Charles) below a farm called Urlarmore on one side of the river and Kilnadrochit lodge on the other side. There are two cottages one on either side of the old approach to the bridge from Tomintoul but there were once other cottages below Kilnadrochit lodge that were washed away in the great Moray floods.
If you are using the Inveravon census then the Bridge of Avon refers to the lower bridge over the river. Avon is pronounced A-an locally which may also cause some confusion. The Brig o Broun is worth a visit. The river has made a fine narrow gorge that is worth stopping to look at. It's a great part of the country that people simply pass through without realising how much there is to explore.
Hope this helps.