Take it from someone who did this two days ago: don't.
Talking to a family member while you are tripping is obviously to be avoided, they know you well so they will easily notice something is not right.
It will be the longest night of your life, you will spend the night worrying about being found out, you will have to choose between risk of intrusion or staying in bed the whole time so you can pretend to be asleep. At some point you will need the toilet and then you will have to venture into the rest of the house, this again means risking seeing your family.
Here is my personal story to give some perspective:
Im visiting my family for the holidays, its new years eve so Im off to the pub with my friends for drinks. I get in at 3am fairly drunk and decide it would be a fun idea to drop a tab (why I thought it would be a good idea is beyond me)
The tab starts to kick in around 3:45am and I put some music on my laptop, music is good and i'm actually enjoying it at this point. Being drunk and coming up on acid I loose track of time completely, I close my eyes and put my head down but I cant sleep, I just descend into a pit of nightmarish thoughts. The rest of the night is just an endless loop of staring at different parts of the room, sitting up, lying down and going to the toilet / getting water.
I remember feeling my hangover, feeling very tired but unable to sleep and listening intently to every sound in the house. Overall it was a long and painful waiting game, little decisions seemed impossible and I felt like I could not let go and let the trip take me as much as I tried. I had to talk briefly to my sister but luckily I could just play the hangover card and refuse conversation.
My lasting memory of the trip is when my mum came into my room to turn on the heating, I was feigning sleep and she said "The boy is tired." in a loving voice that you might talk to a baby in, I felt this deeply and just thinking about it gives me the shivers. When she said that I thought of all the mothers who had ever loved their sons and I realised how much my mother loves me. I can't quite describe the feeling but it is somehow sad. Anyway i guess the message is family interactions are always going to be emotionally charged and you know your family so well that seeing them on acid might give you a new perspective on family life that you are not ready for.
I tripped hard for 12 hours but it felt like a lifetime. When I was coming down (aprox T + 10H) I had to make an appearance downstairs with the rest of the family, so i buckled up and dealt with no sleep, what remained of my hangover and the lingering acid trip. I had a good cold shower and managed to make a little conversation, glad of my hangover alibi.
It was not easy and I really implore you not to do it, wait til you are independent and in control of the space you are tripping in.