On 3/6/19 I took my sons, to get their vaccines at Health Center. There we saw the Medical Assistant who said young son was going to get 3 vaccines and older son was going to get 2 vaccines. Younger son went first. She did not tell me which vaccines she was giving him, but only gave him one on each leg. Then she said "Okay now it is younger sons turn." I told her that that was younger son, and she then stayed quiet as I tried to get older son to calm down as he was crying because he was scared. I had my son wrapped up so she can give older son his shots on his arms, when she said "I am only giving older son 2 instead of the 3." When she had 3 needles there. I thought that was weird as she was a Medical Assistant and did not know she can decide that. She then gave older son 1 shot on each arm, a total of 2. I was questioning if she possibly got their vaccines backwards because of her expression and making that call on the spot. I requested copies of both my kids immunization records, and left once I received them. I then went to work and they stayed at Daycare. They both had fevers that afternoon and were given MOTRIN. On 3/7/19 young son's left arm was swollen and red, and older son's leg was enormously swollen and red. I called On-Call Doctor, as it was after 5pm. The Doctor called me back and told me to draw over the outside of their redness, ice it, and take them in if the red goes farther than the marks. On 3/8/19 the same sections were red and swollen, so I continued icing. On 3/9/18 at 9am, I noticed their sections being bigger and worst, only this time younger son was crying saying his tummy hurt and looked weak. He then got diarrhea. I then called On-Call Doctor around 9:30am, and was told I would get a call back. By 12pm, son had threw up twice, and had watered diarrhea. He had NEVER thrown up or had that sort of diarrhea, so I called On-Call Doctor again, once we cleaned younger son up, which was around 1:30 pm. I finally got a call back from the Doctor and was told to take him to the ER. I took sons to Hospital. Younger son then started getting red marks on his stomach, and slowly going through his body. The doctor went in and I explained about the vaccine situation and said younger son was having a reaction and now had hives. The doctor prescribed clindamycin for both sons to get rid of the infection, but gave younger son BENADRYL for the hives. After giving them their medication, older son's arm was getting worst, as it started getting purple spots, and young son had more "hives" and was weak and with diarrhea. He then started wheezing and that is when I panicked even more! I then realized that the Medical Assistant got their vaccines backwards. She was supposed to give young son the 3 vaccines, and older son 2, and that was why she did not give older son the 3rd one because she realized her mistake. I then checked the copy of the immunization, and she also falsified their documents, and she put that young son had 3 vaccines, and older son had 2. I immediately called the On-Call Doctor and told her about what I saw on the forms and what happened, she told me she would speak to the manager on 3/11/19 first thing in the morning to find out what went wrong, and scheduled an apt. for young son at 9:20 am to get him checked. I continued giving my kids their medication and went to Health Center on 3/11/19 at 9 am. An LVN came out to the waiting room to check older son's arm and his temperature, and said his arm was a normal reaction as he had a live vaccine. I then informed her of the error that occurred with the vaccines and requested to speak to a supervisor. I spoke with supervisor and explained to her what happened on 3/6/19 and how I later realized that the Medical Assistant mistaken young son with older son, and made the call of not given the 3rd vaccine and then marking on the Medical form that she gave the 3 vaccines to young son, and 2 for older son. I told her I needed the truth, need to know what was given to each one, and what was not given. She said she would start an incident report and that the Medical assistant had no call to say what she will or will not give to a child. The supervisor and an LVN then examined young son's legs and confirmed that there was only 2 dots, one on each leg, and confirmed that he was given 2 and not 3 like the medical record stated. Young son has had hives on and off since 3/9/19.