You overcome it by not participating in it. They are the ones required by the WTS to shun ex-JWs and there ought to be consequences for such behaviour. The opposite (ex-JWs shunning JWs) is not a requirement - to do so would be to endorse the behaviour and participate in it, and even worse, it endorses the WTS's claim of authority over the ex-JW.
They want to shun you and your spouse, the parents of your children? Then they don't get the privilege of associating with your children and being allowed to treat their ex-JW parent with disrespect (and thereby set an example of disrespecting their parents). If they want to have their grandchildren / nieces / nephews in their lives, they have to behave in a manner that sets an example of acceptance, love and tolerance of everyone, including people whose opinion on religious matters differs from their own.