"Stepbro" is an informal abbreviation for the word "stepbrother." Here's a breakdown of the meaning:

  1. Stepbrother: A "stepbrother" is a male sibling who is not biologically related to you, but you both have one common biological parent. In other words, your stepbrother is the son of one of your parents from a previous relationship or marriage. He is your father's or mother's child from a different partner.
  2. Step-parent: A "step-parent" is someone who is married to one of your biological parents but is not your biological parent. For instance, if your mother or father remarries after getting divorced or widowed, their new spouse becomes your step-parent.

The same concept applies to "stepsister," which is the term used for a female sibling gained through a step-parent.

Example sentences

  1. My stepbrother and I get along really well; he's like a true brother to me.
  2. After my dad remarried, I gained a wonderful stepbrother who is now part of our family.
  3. Even though we're not related by blood, I love my stepbrother as if he were my own sibling.
  4. During the family vacation, my stepbrother and I explored the beach together and had a blast.
  5. My stepbrother and I have different personalities, but we always manage to find common ground.
  6. We had a small celebration to welcome our new stepbrother into the family.
  7. Despite the initial awkwardness, my stepbrother and I have become very close over the years.
  8. My stepbrother is an amazing cook, and he often prepares delicious meals for the entire family.
  9. When my stepbrother moved in, we redecorated the room to make it feel like his own space.
  10. My stepbrother is attending the same school as me, and it's great to have a familiar face around campus.

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Reference:

Definition of STEPBROTHER
a son of one’s stepparent by a former partner… See the full definition