Common Sense (or lack there of...)

I love my family. I love my mom. But some people in the family lack much common sense. Just today, my mother did some grocery shopping and picked up a prescription for my father. He had gotten this particular medication before and notified her that it cost $10. How much did it wind up costing? $130. My father has been having to pay medical bills and it's put him on a pretty tight budget, so a $120 difference in a medication, is rather huge. If I were in her shoes, I would have have called my father right away and asked him what was going on and if he was 100% certain the medication in question had cost him $10 previously. But, she didn't call and all hell broke loose as soon as she came home and notified him of the charge. She told him he could pick up his prescriptions from this point forth and he asked if a bell went off when she heard the price, having known via him that it was going to cost $120 less. As usual, I had to play the silent middle-man. Yeah, sure, my father could pick up his prescriptions, but it is pretty common sense to call in that scenario. Especially with being cognizant that my father's on a tight budget and notified her that the medication cost $10, it's pretty ridiculous to hear that the price is $130 and not call the guy. Of course, I can't say anything. It'll be me taking sides, when, as far as I'm concerned, I'm just being honest. It's not about taking sides. It's about what's best for the family. I really want to say something, but will have to bite my tongue until we hopefully get some good news tomorrow regarding getting the money back and not having a check bounce. We shall see...