Comma. "a current carer for" is not the greatest phrase ever written, in my opinion. I wonder if it may be better to say "who I am currently caring for".
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Anonymousa comma or no commaComma. If the preceding expression (my mother) uniquely identifies the referent (i.e., the entity in the real world you wish to refer to), you always put a comma before the relative clause. It's impossible to restrict the referent any more than you have already done by stating that unique referent, so a restrictive clause
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