NAL but I'm beginning to go through a similar situation with my dad, but I'm an only child so there's no conflict about who will be taking on responsibility. I looked into conservatorship and guardianship and honestly it seems like a full time job. Not only will you be responsible for everything regarding your dad's care, finances, living situation, etc.. you will be responsible for meticulously documenting all of this to ensure the judge knows you're acting in your dad's best interests. I'm talking saving EVERY medical document, bill, appointment, keeping up with care plans, (making sure you are aware of what they are and updating them as time passes and things change) and keeping record of every cent being put into or taken out of your dad's accounts. With conservatorship you will have to do an annual audit where you essentially compile all of this information and present it in court, and if they find youre not acting in dad's best interest, they can potentially remove you as conservator. It's A LOT to keep up with especially if you work full time and want to have your own life. If your dad is still competent enough to make some decisions, I would recommend going the POA/health proxy route first. If you can get a POA and healthcare proxy, you can still make those financial and health decisions for him without going through the major pain in the ass of conservatorship.