See, I had a different opinion. I think that a sizable number of the Duggar grandchildren look like the in-laws. There are a few who take more after the Duggar side. For example, I think Izzy looks like Jill and Sam looks like John David. Garrett looks like Joe.
But Gideon is all Austin, and the older M kids (especially Mack and Marcus) look like Anna. The younger M kids (especially Meredith) may resemble some of the other Duggars. I think it's too early to tell with Bella and Grace, although I think Addison (who is around the same age range) looks like Kendra.
Felicity definitely looks like Diana though, no question about that.
The one I'm having most difficulty placing are the Seewalds, particularly Spurge. I think he looks like a perfect blend between Jessa and Ben, whereas Henry and Ivy may be more on the Duggar side.