If it's your own money then you may not be doing wrong but since it's another person's money then you're doing wrong . There are things we're advised not to do as crypto investors and traders: never invest/trade on behalf of someone with their money; never trade/invest with amount beyond what you can absorb in the case of a loss. Be mindful of the fact that market volatility may end up not working according to your plans for the end of the year.
I think the OP should pay attention to the above suggestions before he decides to invest part of his father's retirement allowance into crypto investments, the first factor is that the investment fund belongs to his father and he must ask permission from all family members to provide long term investment solutions that have the opportunity to make big profits in a few years , and he must also explain the impact of risk of loss if he does not consistently hold assets for the long term.
The second solution, if all family members trust the management of funds to the OP, then it is recommended that the investment fund is lower than some retirement benefits, for example 30% of benefits, the Op must also be knowledgeable about crypto market analysis and prioritize adding assets by the DCA method or diversification, so that OP has the opportunity buy at any price correction or better be patient waiting for bearish market conditions as BTC prices are heavily discounted.