The real obstacle
In most family businesses the barrier to a CRM is not cost or complexity. It is that the business runs on personal knowledge and informal authority, both of which are genuine assets, and a system asks for both to be made explicit. A senior family member who has held the customer relationships for thirty years is being asked to write down what has been their particular contribution. That is not a training issue, and treating it as one is why these projects stall.
It helps to name what is actually valuable in the current arrangement. Fast decisions without committees. Trust built over decades that survives a bad delivery. Credit extended on judgement that a formal process would have refused, to customers who then stayed for twenty years. None of that should be discarded. The problem is only that it exists in one place, and one place is a risk.