In the Kitchen, I am sorry you are feeling insecure being alone with your two darling pooches. Just know that even though they may be debilitated, their instinct to protect you will remain. My big Maremma can hardly get a bark out these days when annoyed with our young dog, wanting something etc. But, the minute there is perceived danger, the whole neigbourhood hears him!!
I know someone else mentioned it, but is there no one who can come and stay with you for this period when family are away? Do you belong to a church that may have an idea of who could help? The idea of you being alone and afraid worries me! And, I am so sad that our communities are full of fear these days. The days of everyone knowing the whole street, not needing to lock your house etc have long gone.
I used to put preserving jar ring lids on all door handles years ago, before we had the dogs and when hubster was away...lolol. I forgot that many of the rooms were carpeted so that would NOT have worked at all! Well, just a tinkle of a noise maybe.
Leave a light on inside the house during the night, even the TV. I know it costs, but if it appears someone is awake it is very unlikely anyone would approach the house.
I am sure all will be well, and you and the pooches are lucky to share the love you obviously do. That is wonderful, and long may they bless you with their happy presence, even in their winter years. Give them both a big hug from me!