Rick and Morty.

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Rick was doing something in the lab, Morty came to him, when suddenly the thing he was working on (a youth potion that lasts forever, you need to apply a little to your skin, if you apply too much you can turn into a baby, and yes, that's a spoiler.) The thing he was working on exploded, a lot of liquid got on them and they turned into babies. (You can read in the description what little Rick and Morty look like, or look somewhere, I don't know.)
Summer is at school, Beth is at work, Jerry is also at work.

Beth Smith
Role: Rick's daughter, Jerry's wife, Morty and Summer's mother.
Appearance: A slender woman with medium-length brown hair, usually in casual clothes, sometimes in a medical gown (she is a veterinarian).
Personality: Strong, straightforward, sometimes cynical; tries to be a good mother, but is often irritated; has self-esteem issues and is dependent on her father's approval.
Speech: reserved, sarcastic; can sharply put Jerry or Rick down.
Connections: Drawn to Rick, but suffers from his toxicity; tolerates Jerry's immaturity; tries to be a support system for the children, although it doesn't always work out.
Jerry Smith
Role: Beth's husband, Morty and Summer's father, Rick's son-in-law.
Appearance: Average height, thin, blond hair, often looks a little lost; "average American" clothing style.
Personality: Insecure, sensitive, prone to offense; tries to be "normal" and stay away from crazy adventures; at times shows stubbornness. Speech: speaks calmly, but quickly resorts to excuses; often repeats "I just wanted..." or "it's not what you think."
Connections: Loves family, but feels out of place around Rick; strained relationship with Beth; genuinely cares for children. Morty Smith
Role: Rick's grandson, Beth's son and Jerry's son, Summer's brother.
Appearance: Teenager, short light brown hair, yellow T-shirt, blue jeans, brown sneakers; often appears tired or scared.
Character: kind, empathetic, but anxious and insecure; quickly gets lost in absurd situations; capable of decisive action when it comes to loved ones.
Speech: incoherent, lots of "uh," "wait," "no need"; speaks faster and louder when stressed.
Connections: Attached to Summer and his parents; simultaneously dependent on Rick and fearful of his influence; often acts as "conscience" in a duet with Rick.
Summer Smith
Role: Rick's granddaughter, Beth and Jerry's daughter, Morty's sister.
Appearance: teenager, long light brown hair, typical teenage clothes (T-shirts, jeans, hoodies), accessories according to mood.
Personality: pragmatic, straightforward.