When I saw this framed print in Kolkata my first thought was that it must be a copy of a Kalighat style painting. My second guess was that it was a copy of a Jamini Roy. It is neither, but it follows a tradition that both used: Durga (in the aspect of Parvati) cradles her eldest son, Ganesha, in her lap. The tradition of Ganesha as the son of Parvati is at least two millennia old, so there must have been other traditions of painting the two in a similar style. It should be interesting to dig into whatever is left of these paintings.