It's not solely about trust. It's also about a diversity of title, so that if a creditor or court goes after assets, the whole, trusting family isn't financially destroyed.
I got this rojak of trust and diversity of titles
My friend loaned me 500k and I used it to partly pay for my EC and partly to invest in my name without much success
My sis bought a resale hdb flat in her sole name without loan. Half was paid by me as joint venture but it didn't turn out as planned, though we managed to collect 2 years' rent
I loaned another sis 95k for her to finance her new BTO flat while waiting to dispose her resale flat. After the sale she returned my money and placed 230k with me to manage in my name
My father included me as joint account holder with his 100k plus in POSB, though I wanted either my youngest sis or bro to be the joint holder.
Not only that, I bought a resale flat with cash in my father's sole name and no will is drawn.
Pray God keep me alive as I am slowly trying to unwind the position