Ethics of bidding on family item at auction

[slightlyrounded]

I’ve had a bit of a situation come up and need some advice. My grandfather recently passed away and left the estate a considerable high end book collection. Most of these books have now been liquidated but a couple of the very high end books are being put up for auction. Because there are several family members that stand to benefit from the proceeds I didn’t want to approach my family with an offer. But I am in a financial position to purchase at least one of these items for sentimental reasons.

Does anything preclude me from bidding ethically speaking? Are there any steps I should take prior?

Thanks in advance!