Sorry in advance for the long message, however, I think it is really good you are wanting to transition. My advice (as well as the meal ideas) is try not to be hard on yourself, buy ethically sourced meat if you can to get rid of some of your guilt, and importantly if children are old enough make them do the extra washing up your veggie transition causes.
Meal 1: 3 bean chilli for you and beef for the family. Make a basic chilli base and add kidney beans to simmer while cooking beef in another pan. Add half the bean chilli mix in with the beef and simmer for your family. In the original pan add in another two cans of beans (black eyed beans and black beans most likely), another can of tinned tomatos if necessary and if anaemic a bag of spinach. Serve with rice and if concerned about protein cheese and sour cream. Then freeze your leftover bean chilli to have one every week or two alongside different sides when you can’t have the family meat meal, eg. Chilli and jacket potato, chilli and rice, chilli nachos, Chili tacos ect.
Meal 2: Sausage casserole. Make a sausage casserole, mash potatoes and maybe a side of broccoli or other green (good source of protein too), but cook sausages separately and add into two pots at end for final summer. Meat sausages for family and either Richmond or cauldron for you (although you 100% could trick whole family with Richmond).
Meal 3: Shepherd’s pie. Make a normal meat and veg filling shepherds pie for family. Make a smaller lentil one for you (lots of recipes online). Most the non- meat ingredients will be the same, eg. Carrots, peas, onion ect so you will be chipping for both meals. Then top with mash and a generous serving of cheese as you said you are a big cheese fan. Serve with same greens on side, maybe kale if concerned about iron.
Meal 4: Risotto (presuming your family eat it). Chicken and mushroom for family. Mushroom, pea, and spinach for you. Make a mushroom risotto as normal, cook chicken on side. Add just over half the risotto for the rest of the family into the chicken pan. In the other pan add in frozen peas and a bag of spinach. Serve with garlic bread (as butter has protein haha) if you would like!! Freeze any leftovers again for when you need a quick meal/meat free option when family meal is harder to adapt. This is also a perfect opportunity for you to try a chicken substitute if you would like, eg. Tesco own brand, asda own brand, fry’s, plant pioneers etc.
Meal 5: Chicken curry and paneer and spinach curry ( start with paneer but also can do chickpea and sweet potato/aubergine/potato spinach or try another chicken substitute). Make a curry base (can use jar if not from stratch), fry chicken on side. Split in roughly half, adding half to the chicken and veg one. Add a veggie option to the other half. Serve with rice and Naan. If you do not like the paneer or chickpeas or whatever, do not feel too guilty if you end up eating the meat curry or get one of your earlier meals out the freezer.
Meal 6: Fajitas. Fry fajitas veggies (mushroom, pepper, onion etc) in one pan, chicken in another, and if you wish maybe seitan or tempeh in another (these are a more naturally found chicken substitute but could also use one of the subs you tried earlier/a new one). Serve all in separate bowels on table, sides of guac, salsa, cheese, sour cream, maybe an actually side like sweet potatoes wedges. Then the whole family can help themselves ato build fajitas and you maybe actually find they like sietan or whatever meat free option you try.
Meal 7: roast dinner. Make your usual roast dinner veggies, meat, potatoes etc. However, for yourself make some veggie haggis (or veggie sausages, seitan etc). Serve as usual and maybe even your children will like the veggie haggis.
Other meals that work on same principle are Thai veg/Thai chicken curry, paella, tacos, sausage and mash, etc 