Hugs Palmira, I know this is a tough stage.
As you probably know, BW does not support any CIO. This age is particularly challenging because of development and changing sleep needs. It's apparent he is developing verbally and that definitely disrupts sleep (in my experience). I would go to him every time he cries out for you if it's above a mantra cry. Some moms here have said that if they actually call your name to go to them immediately and say "Momma's here, it's night time, I love you." and leave. Then return if they cry out again. To be honest, I had to stay on the floor next to his crib and rub his back during this phase. We did have to do some sleep training after the phase passed, but it was worth it for us to help him feel safe, secure, and return to sleep quickly. Having said that, you want to maintain as much of your routine as possible so even if he requests books, don't bring them. Gently and firmly say that it is night time, but that you're there and you love him.
As for the daytime behavior, it is known that children behave "worse" with family, primary care giver BECAUSE they absolutely trust you the most. It's similar to how we put down our guards for our partners and not put forth our "best" behavior once we're more comfortable. It's natural and they truly are not trying to be manipulative. They need us the most through those phases. For us, we cuddled a lot more before bedtime, talked out what we were doing often, used and took around a comfort item, but most importantly, I taught myself how to breath bc the tantrums were so bad around 18-20mo (worse than the 2yo stage... which was actually pretty great for us).
In terms of sleep... If you want to, you can try shortening nap to 1.5 hrs instead of 2 to help him be tired enough for bed. I remember coming on BW wondering why he was taking 30-60mins to fall asleep when it used to take him less than 15! For my son and another friend on here, they both dropped their total sleep hrs considerably, mostly with nap, during this phase, then returned to sleeping longer for naps. Sometimes, NWs are indicative of too much day time sleep as well so it's worth a try.
What do you think? many hugs.