There are a lot of anime Mother + Son relationships I really admire. Kushina and Naruto Uzumaki is a main one but since it already got mentioned I'll go with Delia/Hanako and Ash Ketchum/Satoshi from Pokemon. Both pairs always reminding of me and my own Mom in particular XD Inko and Izuku Midoriya do too so they are quite a close seconde !!!!