Another option would be to consider a 2 family and there are currently 3 on the market right around your price range. Click this link to see them all with a map:
The only single family property coming up using the key word "in law" is the below. Looks like a complete gut renovation (but a nice lot). Chances are you will need to pay all cash (or put more than 20% down). I cant imagine you can get traditional financing for this project.
Here is every property on the market in North Attleboro:
Hope that helps!
While there are a few homes in North Attleboro that are currently, or could easily be converted to be, suitable for an in-law arrangement, there are several opportunities available in Attleboro too...even Plainville and Wrentham...if you are flexible with location!
If you'd like to email me directly at email@example.com I will send you some listings. There is simply not enough space here to do so!
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