How to navigate new NK with separation anxiety ?

Hey all. Im a newer Nanny. I started nannying Nov 3rd and I just started working for my 3rd family. They are absolutely lovely. So sweet and welcoming and want me to feel right at home which is what im always looking for. Nk is 14 months old which is a challenging age to incorporate a new nanny. He’s had a nanny before but that was at 9 months and he had not yet developed separation anxiety . Since then his Mom and Dad have taken care of him at home 50/50. The Dad is not home everyday but Mom works from home. The Mom has described her approach to incorporating me as wanting him to see that I am a friend of the family and building trust by having me around. So I have spent the whole week with them every morning just being around. Nk does love me. He frequently shows me lots of affection and gives me kisses. However when I try to help or care for him by holding his hand or helping him in his car seat with Mom around he cries. I believe he thinks that I am trying to take him away from Mom. He gets very agitated and will cry and run to Mom or Dad every time. From my point of view if we continue with this approach I think he will always prefer his mother and Father and will never let me do anything with him. I don’t see him making that switch any time soon with the current method we are using. He does spend more time with me now but not more than 10 minutes before he runs to mom. MB is open to other methods but you can tell just fully stepping away and letting him cry (I’ll be trying to comfort him ofc) is not something she is ready to do and I totally get that. However, I feel like that would be the best method. Since she works from home I think it would be good for me to take him out and comfort him without the pressure of her around . I feel okay with her around but it’s just a little harder to do my job that way I feel like there’s a time limit before she doesn’t think I can do it. I’m very confident in my abilities and I feel like there’s a big chunk of my job I’m not able to do which is comfort and care for the child. I feel more like an aid and it causes me to become very under stimulated and just wanting to go home. What do you guys think? Do you think he will ever gravitate to me with the method we are currently using or should we cut Mom out cold turkey?