How can I deal with the pain I have in me for not being in my familys life anymore?

I sent Christmas gifts to my family, but we had kind of a fallen out prior to that, so when they(my mom & sister) received the gifts they called and said they was coming over the next day to bring the presents they had for us, but I was not able to deal with them(emotionally) so I ask my husband to ask them not to come. So instead of sending the gifts they had for us to us, like I did theirs. they sent ours back we had for them and also the gifts I had for my niece and nephew. My mom sent a email stating she was sending the gifts back and that she wouldn't let my niece and nephew even know they were there for them. and she went on to say she didnt know why i hated them so much blah blah blah and that she would honor my wishes and not bother me anymore.
well this would be soooooo long if I tried to tell the whole story from beg. to end. but I feel so hurt. I cant believe these people (mom & sis) profess to be christians and go to church every sunday, would be so hateful to do this and especially to those kids. I can't believe they sent what we bought for the kids back and what? never gave one thought to keep the gifts I sent to them and just send us ours that they had for us beings I was in the emotional state i was at the time.
Can you make head or tails of all this? I feel like I could never bring myself to speak to them again for doing what they did. They (the kids) shouldn't have been punished because they (mom & sis) were mad at me. and the hardest part besides how my niece and nephew must feel is I have to find a way to forgive them for all this. I am in fact a true christian, but Im hurt beyond words especially for those kids. and would really like to hear what others think about this. Thank You!

I completely agree with your mother and sister. What you did was wrong. I don't know how far (physical distance) you guys are from each other, but you mailed them gifts, and they offered to GO TO YOU to give you gifts in person, and they probably were going to bring the kids to see you. Now let's say they gave the kids their gifts, and then their kids would be all happy, but then they'd have to explain to the kids that YOU didn't want to see any of them. They're just children, they wouldn't understand it. Your mother and sister did those kids a favor by not telling them anything. It's like if the family went on vacation and their dog died, so they bought a new dog and buried the old one without telling the kids. Do you see what I'm saying? They kept those kids from getting hurt. Hurt by you. This has nothing to do with religion, it doesn't matter if they're Christian or not, you were in the wrong, and your mother and sister did the right thing.