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hi! so i’ve actually heard very similar things coming from many people with OCD and while the false memories can feel vivid and overwhelming, the entire nature of them is that they are FALSE. I’m not trying to give reassurance, just a reminder of reality to hopefully help pull you out of your spiraling thoughts. One thing that supports the fact that this occurrence didn’t really happen is your very apparent disdain for such actions. It is very unlikely that you would commit such acts with the morals you have. OCD targets the things you love and attacks your most solidly held core beliefs. As to whether or not you should tell your family, maybe you could approach it with sharing the thoughts you’re having and that they scare you. Maybe this can open the door to getting some family support directly surrounding this fear.

Do not confess. I know it’s tempting, but this is probably just a false memory. They can be extremely vivid, and indistinguishable from actual memories. I would know because I’ve had scarily vivid ones pop up too when I start analyzing the past. Your brain can create a vivid memory out of thin air with no sign that it’s fake, so don’t be tricked by how real it seems. The brain is more than capable of generating vivid memories. This is very common in OCD

If you are seeing a ERP therapist he or she will help you accept uncertainty, the thing is you will never 100% certain you didn't do X to your sister ,but accept uncertainty maybe I did ,maybe I didn't, if X actually happen you have to ,this part is the hardest to accept that but be okay and move on with your life

I also can't afford to see a ERP therapist, but I took nathan perterson self directed online master your ocd course it is helping me ,check out his YouTube channel ocd-anxiety he has videos that can help you