That's false friend with Russian. Love is „kochać”, „lubić” is only like.

It's either „wy kochacie” or „ty kochasz”.

Ooops, oversight, versions with pronouns haven't been accepted. Added now.

"tamci" is used for the 'masculine personal plural'. The singular word "dziecko" is neuter, so by definition the plural is 'not masculine-personal'.

Even if the particular children you're talking about are only boys, if you decided to use the word "children" and not "boys", it's still 'not masculine-personal' and therefore "tamte".

done