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The word 'mother' should be capitalised in place of someone's name. However, since you have already mentioned that she is called 'Sonya', the word 'mother' should not be capitalised.
Coronavirus has both brought families together and apart. Some have become more close as they spend time together. Others are separated in many places all around the world. Either way it has been hard on all people living without loved ones. That is why it is very important to spend some time talking to the family members around you. We might be tired of them now but soon when everyone goes back to school and work we will miss all the time spent with family we used to have.