I'm sorry for your situation. When I was in the org, I told my JW kids that nothing would ever cause me to shun or abandon either of them. I felt that this was so cruel and wrong. It's a shame that you are in this situation. After I left the org, my kids and family started shunning me (before being DFed).
Like you, I moved on and went on with my life with or without them. I met a wonderful and kind woman (not a JW). Likewise, the whole family shunning issue was difficult for her and her parents to understand. We married and I was disfellowshipped. Her family had opened their arms to me and couldn't have been more loving and supportive. It took some time though. It was foreign to them and completely unnatural. Though I miss my kids and parents, I have a new family that is not contingent on towing the WTBTS line. They are good people and I'm sure that your boyfriend's family will be the same way if giving the time and some education on the "JW way." Your boyfriend sound like a great and supportive man with you and your child. The family that opened their arms to you is a good situation to be in. This situation will take some time to work itself out. Time is a good healer.
As far as getting the "side eye" from your Bf's dad, might I suggest one Youtube video. John Cedars (Lloyd Evans) produced a great segment on Youtube in regards to the sickening convention, "Remain Loyal." One of the sections is a rebuttal to the shunning episode. There is a similarity to your situation and they drama portrayed at the convention. Explaining to your Bf's family that shunning is indoctrinated into the JW culture and taught at large assemblies might ease their suspicions. Since this is from a 3rd party on the otherside of the world, I think that seeing this video would explain the real situation that you are in. They would learn that there is nothing wrong with you, but that you are a victim of a controlling cult that places the cleanliness of the org above everything else. Best wishes. The link is below.