@vikorr,
I agree with that, vikorr.
I also agree with saying thanks most of the time to most people when they do something they don't have to, to help you. Reasonable and easy.
There can be complications to all that. I'm aware of myself getting pissy about people who seem to generally live life as helpers of all, because their behavior is a way for them to be virtuous, or they see that as a role in life; usually that is not someone's main motive (self wonderfulness, for whatever reason), so that doesn't usually come up, but it can. Usually people just mean to help a situation, period.
In the case of siblings, I can see things getting sticky: I've no experience with siblings. I did have a cousin resent me strongly as a child and teen; then not resent me for years, genuine friends; then resent me again; so I slightly understand. Her sister had it worse. But - there are two or three sides to most stories.
Adds, I once got seasick on that boat to Catalina. It had lost an engine and the ocean was choppy that day. But that ended up being an oddly good memory, as I like Catalina.