Yes, you would, I would say it is better to breed with the mom, since babies are kind of similar genetically, while the mother has 50% of genes they do not have (I mean, the babies get 50% of their genes from each parent, which means, 50% of every parent´s genes the babies do not have), IMHO it is always better to breed back to a parent than amongs siblings, I am no breeder expert, but I have bred some, and I spend my share of time reading about their genetics.