MissAdventure, your post hit very close to home for me.
That is exactly what went on in my husband’s sister’s family - drug abuse, excessive alcohol consumption, violence and criminal activity. Only, my MIL didn’t want it uncovered either. MIL and SIL brainwashed those children into believing that things weren’t that bad and alienated them from their father - who was their way out of the dysfunction.
But she had no problem phoning the police on my husband and making false allegations against him when he confronted her on it (although, there were many other issues).
And still, to this day, she claims she has no idea why my husband has no relationship with her.
I feel so sorry for that poor woman and her grandchildren that you mentioned in your post. Any normal grandparent would have done as she did. It’s awful that the police or social services did not investigate. Those children could have been placed into her care, instead of going into the care system. Such a sad, sad story. Those children were badly let down by their parents and by the systems that are there to protect them. Awful.