Copy of Kupecky

At Quentin from Berlin, they sell a "Dutch, 17th / 18h century" portrait of the painter and his family, estimated at 3,000 Euro.

It is a good copy (but probably not good enough to be an original) of a well-known painting by Jan Kupecky (1667-1740, also known as Johann Kupetzki) from the Budapest Museum of Fine Arts. I have found no evidence of other old copies of this painting, which is quite remarkable and unusual (not many current artists would paint a family portrait like this probably, but I guess it is meant symbolic). Whether it is worth more than the estimate is not clear though.