As you said you have other responsibilities in your family so I suggest to buy if you have an extra money.
You can buy and store it if you want the most important is use first your money to your family and if have extra buy Bitcoin little by little.
right decision because there are so many people who earn lots of money but they are unable to spend some amount of money on family so I think first priority should be the family money can easily achieved it once start working hard.
There is no need of earning lots of money but that amount of money should be earn which can easily fulfil your needs because needs can be fulfilled but dreams never ends.