Do you mean without them quarreling and leaving? This tip works with all mods / versions. Download a save game editor (MNB Save Editor). Open your save game file. Open the "Troops" section. Scroll down to where you see Companions names with "trp_NPC1 trp_NPC02" which will have their actual names to the right. Start at the top and do each companion. Open the companion entry, then "slots" and scroll down to numbers (71) and (73) (Slot troop pesonality conflict object). Make this a number of some random lord, but NOT a companion (e.g. 600). If (72) or (74) are non-zero set them to zero (if companions are already fighting this will happen). Save. Do this for each companion and they will be one big happy family.