How can I type ' as in сім'я? I just can't find it. (I have a Cyrillic keyboard already)
You just use an apostrophe
If you use the Ukrainian (Enhanced) layout on Windows, the apostrophe is on the key with ` (grave accent) and ~ (tilde).
The layout called just "Ukrainian" (without (Enhanced)) does not have the apostrophe. Don't ask me why...
Go on to advanced characters or just switch to english.
Is it most common to say і or та?