Little brother problems

Tynisha • Mother to Skye
So my 9 year old brother just wrote me a letter describing how he feels . Apparently he's sad that I'm in a relationship and assumes I don't love him anymore . I keep stressing the point that the love I have for him vs Tony is completely different. I would love to go places as a family, but he acts so rude towards us both. I'm not putting my boyfriend before my baby brother, but I won't tolerate him disrespecting us. Its gotten to the point where I can't get him to commit to school work, or help around the house, he completely ignores me, this all started when we started dating. I love my baby bro, but I can't deal with the jealousy.