ה שְׂבֵעִים בַּלֶּחֶם נִשְׂכָּרוּ, וּרְעֵבִים חָדֵלּוּ, עַד-עֲקָרָה יָלְדָה שִׁבְעָה, וְרַבַּת בָּנִים אֻמְלָלָה.
5 They that were full have hired out themselves for bread; and they that were hungry have ceased; while the barren hath borne seven, she that had many children hath languished.
Samuel, Chapter 2
Chazal, our sages, say that Chana was barren for almost twenty years. They and the Biblical text also say that she only brought her beloved and much prayed for son Samuel to Eli, the High Priest, at Shiloh when he was weaned. He was probably five years old, since that's also the traditional gil chinuch, age to educate.
At my neighborhood, Women's Shabbat Shiur, Torah Class, we tried to figure out how old she was when she finally has Samuel and how she then managed seven children.
My mind started going in a very different direction. The word "seven" in Hebrew, שבע sheva. I didn't have the actual text in front of me, but now that I've copied it to the post, I realize that I didn't need to ask my neighbor for spelling information.
שבע sheva, un-voweled has a number of meanings, besides 7. It can be an oath, to swear, or if you use the ש shin, as sin, sove'a, it means to be satiated, satisfied. That same meaning for the root, שבע sheva, is actually used in the beginning of the line. You don't need to know Hebrew to recognize the letters.
We can now reinterpret the line to mean that "the barren mother is now satisfied." In other words, she has enough children, she no longer suffers, yearns for children. We now don't know how many siblings Samuel had via his mother. I'm not enough a Biblical expert to know if any maternal siblings are mentioned in other places in the Bible.
Gmar Chatimah Tovah