@ead An excellent question. I can only talk from my own experience and issues within my family. Until my mother passed and financial stuff was on the radar, my siblings and I got along well. Yes we had our fights but nothing that destroyed our bond.

Mum made both my father and I co executors as we were both lawyers at the time. My father did all the things and I co signed his decisions. This was because mum’s death caused underlying sibling issues to implode. My siblings were very upset I had been made co executor and didn’t want me making any decisions. Luckily my father was still strong and well and could deal with the unexpected problem.

Dad had made me his single executor in his Will and all was quiet for many decades. When he had a serious health episode some years after mum’s passing my siblings questioned who was executor and who was as getting what under his Will. They speak as if dad’s property is there own and threatened to take him to court if he didn’t change his Will to remove me as executor!!

Again a massive implosion (while Dad was still fine with many years under his belt!) Dad and I were shocked and agreed between us that he would appoint a third party we all agreed to - ending up being a family friend who is a lawyer and would be paid for his work. The crazy thing is now dad is well enough but has undiagnosed dementia they push it onto me to look after his finances etc - pay his bills, identify repairs needed
and organise contractors. Despite being diagnosed with stage 4 appendix cancer and going through extensive treatment then 2 years of recovery.

All I can say is that it depends very much on your family and especially whether 2 would work harmoniously and comparatively together.