Bosch appliances are made by a Bosch-Siemens joint venture. The most common consumer goods made by Bosch alone are power tools.
I would make an exception for buying Bosch tools even though I usually don’t buy anything durable from Nazistan (and all the more so given Zeresh Merkel yemach shma’s position on Arab terror in EY), but given the horrendous record of Siemens, I would not touch Bosch appliances.
Bosch was never Jewish owned. If the family has Jewish roots, they go way, way back before Robert Bosch was even born.
Jewish owned at one time would be AEG (which you probably don’t find in the US unless you’re looking for very heavy-duty power tools such as what you’d use to give Og Melech Bashan a bris).