One recommended approach would be to export all the contacts from Gmail (Google) and import them into iCloud.
Login to your Gmail (Google) account, go to contacts and export all the contacts. You'll find the command in the left sidebar.
Now login to your iCloud account, go to Contacts, click on the gear in the bottom left and click on import.
All iPhone [or All iCloud if you have that set up] is the 'master list'.
All contacts are in that list.
All other lists are sub-sets of that.
Anything not in any sub-set will only appear in the master list.
If you delete something from the master list you are also deleting it from any & all sub-sets.
I would suggest the following solution but you need to take care of it from Macbook which is using same Apple ID.
It is best to always have a backup before attempting something like this
Open the AddressBook folder located on:
In that folder, you will find three files:
There is no such an option for Siri.
But you can adjust Siri to call your "Mom" by sayin "call my mom" and Siri will ask who is your mom from contacts then you can set the name of mom.
Uncle, brother, sister, dad and etc. can be learned by Siri also.