"I hope all is well with you" is already a full sentence on its own. However, you could add something more to it based on the recipient and context. Here are some ways to add to it (or not!): I hope all is well with you and yours. I hope all is well with you and your family. I hope all is well.
All is Well atau All Izz Well yang artinya "Semua akan baik-baik saja" ini begitu mendalam kata-katanya. Sebenarnya dari frase kata2nya dalam bahasa Inggris salah. Karena "All" yang menunjukkan jamak/lebih dari satu, harusnya diikuti dengan penghubung "Are", bukan "Is". Op8x.