What's the best way to tackle a relative who has an opinion on everything related to the way I bring up my children?

Yup, same as what everyone is saying. Good to keep an open mind, thank him/her for the input and consider if the advice would be helpful to the situation. While there are some who always have something to comment, there are also some comments that may be worth considering. At the end of the day, just do what you think is best for your child. You need not explain yourself to others but if you feel a need to, just tell them your rationale so that they could understand your point of view. Even if they feel that their way may be better, you have the ultimate say. Smile and just tell them you would still prefer your way for now.

You will encounter such people almost at every step of your parenting journey and the best way to deal with such people is hear them out but do what you feel is best for your kid. This way, you do not upset or hurt their sentiments and still get to do all things parenting. Plus, you never know, you might get actually get some good advice or get to know about something you didn't know before.

There is always someone who does this!!!! I know it is irritating, frustrating etc etc but have an open ear. Ignore stuff that contradicts and you already know is the best practice. But if it contradicts and you do not know about it, it might be worthwhile to do some googling. Best way it to hear out else you will end up discussing even more and frustrated even further :)

I will just smile and will not reject his/her opinion. There was once I argued with a relative on my approach in parenting and it turned out hurting our relationship. Thus, I will just take comments as a pinch of salt. Unless, the person is very rude and insulting, I will definitely stand up for myself and kids.

Smile and in this way, you acknowledge what they say but that doesn't mean they are right. If they keeps repeating especially old folks, tell them nicely that you will teach your own child and thank them for their opinions.

Few people are impossible to deal with, just ignore them. Thank god, I have so much of patience and I always been a good listener. So my advice is to try to be a good listener, you know what is best for your kid.

Best way is to smile, nod and walk away. If they insisted of you saying something. Just say i will think about it. This way you wont offend anyone

The best way to tackle your relatives opinion is thank them and give them the valid source about why you raise your children that way.