Okay kiddo, so socialism is an idea that says we should all work together and share things fairly. This means we should help each other when we need it and not just think about ourselves.
Now, in a liberal democratic constitution, we have rules that say everyone should be treated equally and have rights to things like freedom of speech and religion.
Sometimes, people who believe in socialism want to include ideas in the constitution that say the government should help make things more fair for everyone. This might mean things like guaranteeing everyone a job or making sure everyone has access to health care.
However, not everyone agrees on this idea, and that's okay too because in a democracy, we can have different opinions and still work together.
So, in summary, socialism in liberal democratic constitutions means that some people want to make sure everyone is treated fairly and the government helps out, while others believe in more individual freedom and responsibility. It's all about finding a balance that works for everyone!