Baby says mama and mum mum

Hihi,baby now 12months being saying mama and mum mum since 8 months. I tried to let him know mama is me. I tried to avoid baby language like eating,grandparents kept telling him mum mum. So idk will he get confuse with mama and mum mum... I tried to explain to both sides but doesn't work... so when they said mum mum meaning eating to baby. .I just kept telling baby,food food,eat... Isit ok not to correct? Tiring to do this everytime...Will they outgrow and address me correctly certain age?