• spread into multiple wallets
  • inside each wallet spread into multiple addresses with smaller amounts easy to be moved when is necessary.
  • each wallet with multiple backup copies placed in different locations.
  • if you want to give access to family use a system of multisig, but only for part of thr btc not all and don't complicate too much.
  • use the 3levels of stash: hodl, cache, spend.
  • if you are not well comfortable with software, use hardware wallets. But just from this question you ask I suppose that you don't know well how to use software wallets in a safe way.
This is what I would do
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