I, too, used to say this to my mom, and before me, my father to his mom. All we elders have to take the brunt of being born first - loved so and discarded so callously to be eternally ignored. But the fact is, I was and will always be the Beti Number1, like you are Beta Number1. The early bird might catch the worm, but on the flip side of it, it's the early worm that gets caught. On some days, we elder ones are the birds, and on other days, just worms.
Life is like that.
Just enjoy it. Another fact is that both of you - you and your brother, are especially lucky people who can be friends for life. And you get to live together - helping, fighting, playing, creating memories that no one can share or match but only you. Then, I thought of all mad things I did with my siblings - bitterest fights, silliest jigs, cycle rides and midnight bites. You have seen how viciously your maasi and I fight, but if I think of the first person in my mind I truly love, care and do anything for, it is she.