Reunion of 4 generations

Dear Friends,
Me and my closest family members are living in different european countries. My mom, sister and my nephew who is 3 years old live in nearby cities in Varna region in Bulgaria. My beloved grandfather who is 85 lives in South Poland, Lower Silesian county. For the past few years several medical troubles has unfortunately effected all of them. My mom has suffered from brain stroke in the beginning of 2017. My sister is suffering from diabetes and is half blind despite the several surgeries and my gradfather is just too old to travel abroad. Because of that he had never seen his grandgrandson. All of them have difficulties to organize themselves because of physical, medical and also financial reasons. As time is precious, especially for our elder beloved ones, I have came into this idea to find funding for a family trip that will bring my family from Bulgaria to Poland for few days. Such funding will mainly cover their airplane tickets with regular airline that will give the comfort for passengers with reduced mobility, travel with children and normal luggage allowance. Accomodation and food funding is not required as it will be covered by me in Poland. My plan is that they can spend Easter holidays 2018 together in Poland, which means end of march/beginning of april. I have calculated a cost for 3 adults travelling with small child with possible transfer costs to around 750 euro using either Bulgarian or Polish airlines. Raising the money would be perfect opportunity to all of them to meet, four generations, in one place. To have a talk, to eat some festive food and enjoy theirselves. A chance that they shall use now, before life brings other bad decisions. I thank you so much in advance.