I've done this for several relatives. For the 94 year old mother in law, who's financial person
had her in 90% equities, I dropped her to 50\25\25. There is enough liquidity to last and she and her family know that losses can occur but not as severe as before. I chose not to manage her account
because I do not like back seat drivers who don' know how to drive (I only have a learner's permit.)
For the younger nieces and nephews, I've made sure they had emergency funds, Roths and some type of 401k\ira set up. Vehicle of investment choice is VGSTX which offers broad diversification across asset classes at low cost. They are told to go to Vanguard and read about the fund. Also told to educate themselves before investing in individual securities. I also step out but tell them I'm happy to be consulted. Don't want to risk the relationships.