In the topic I see this:
Q1. Same mobile network IP address?
A1. Just like many devices, the IP can change for many reasons. This is as it should be.
Q2. Then i checked that my father's celluar IP is the same (except the last number again)?
A2. That's not a question. End your statements with a period so folk can find the questions.
Q3. Is it because we are family and they give us the same ip's or everyone, who uses that mobile operator gets that ip?
A3. If the last number in the IP is different, it's a different IP. So I would be guessing you wonder why a carrier uses an IP RANGE. That's because this is how IP ranges are doled out. The topic of public IP ranges is well done on the web. I can't condense it to fit in this space but here's a Wikipedia about how IP addresses are not people. So it does not make sense to say this address is you.
Sorry if my question sounds stupid I am paranoid type of person and i always check what ip's were logged to my social accounts. For example i am only logged to facebook through my phone mobile network through the celluar carrier. I noticed that only the last 1 or 2 numbers of the IP change from time to time, but the rest of the ip remains the same. Once i logged from my sister's phone and for my surprise facebook did not notified me that new device was logged in (an option i had set up to notify me when new device loggs in). My sister has Xperia z3 and i have z5, when i check the IP's (her's and mine) were absolutely the same, exept for the last 1 or 2 numbers- those that were constantly changing anyway. I thought it's because both of our numbers are on my mother's name and somehow we are using same IP. It turn's out that all of my mother's numbers use the same IP. Then i checked that my father's celluar IP is the same (except the last number again)? Is it because we are family and they give us the same ip's or everyone, who uses that mobile operator gets that ip? Please excuse my bad english